fix: add prices fields to price list query config to include variant_id in response

[ashif323]

What

Adds prices.* fields including prices.price_set.variant.id to
adminPriceListRemoteQueryFields in the price list query config.

Why

The GET /admin/price-lists endpoint was using adminPriceListRemoteQueryFields
which did not include any prices.* fields. This meant prices were never
fetched from the database, and buildPriceSetPricesForCore never received
price_set.variant.id — so variant_id was always missing from the response.

The transformation logic in buildPriceSetPricesForCore was already correct
— it maps price_set.variant.id to variant_id. The issue was purely that
the prices fields were missing from the query config used by the list endpoint.

Affected file

packages/medusa/src/api/admin/price-lists/query-config.ts

Related

Closes #14995

---

Note

Low Risk
Low risk field-selection change, but it expands GET /admin/price-lists queries/responses to include nested price data which could affect response size/performance.

Overview
Updates the admin price list query config to include nested prices.* fields (notably prices.price_set.variant.id and price rule fields) in adminPriceListRemoteQueryFields.

This ensures GET /admin/price-lists fetches price data needed for downstream transformations so responses can include the associated variant id.

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[changeset-bot]

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Latest commit: b49f6a2

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[medusa-os-bot]

Thank you for your contribution!

After reviewing this PR, we need a few things addressed before we can move forward:

Required changes:

• Complete the PR description — the How and Testing sections from the pull request template are missing (they appear as ## Affected file and no testing section). Please describe how the changes were implemented and how a reviewer can verify the fix.
• Add a changeset by running yarn changeset and selecting @medusajs/medusa as a patch bump. The changeset message should follow the format: fix(@medusajs/medusa): add prices fields to price list query config to include variant_id in response.
• Add or update integration tests in integration-tests/http/__tests__/price-list/admin/price-list.spec.ts to verify that variant_id is present in the prices array when calling GET /admin/price-lists. Changes to packages/medusa/src/api/ require corresponding integration test coverage.

Concerns:

• Expanding adminPriceListRemoteQueryFields with prices.* fields will increase the payload and query cost for all endpoints using retrivePriceListQueryConfig / listPriceListQueryConfig (list, retrieve, update, and delete price list endpoints). This is likely acceptable to fix the bug, but the team should be aware of the broader query expansion beyond just the list endpoint.